I've been living with my gf in Isan for 2.5 years and met her 5 years ago. Lately she's been having a lot of mood swings and been arguing with me over minor things. Today I got confirmation that she's been lying to me about her whereabouts. I started to have doubts as she didn't pick up the phone a few times over the last weeks and told me hard-to-believe stories like "I got a flat tire but there was no nail". Then why didn't she call me while she was waiting for it to get it topped up for 2 long hours??
So I decided to check her Google Maps timeline history and sure enough there was no flat tire, she was actually in some remote village that I have never been to. She was there for many hours several times over the last few weeks. So now I'm thinking either she's cheating on me (unlikely, at least I really hope not) or she's been gambling at card games ("casino" like they call it over here). She used to play that casino game early in our relationship and lost huge amounts of money. I managed to make her quit that addiction and now I'm worried she might have been playing again... She started gambling on her phone lately but it's been like 200-400 bahts a day which isn't too bad. I give her 20k baht a month no strings attached but I really don't want my hard earned money to go to waste like that.
Anyway, I need to stay cold headed about this because she doesn't know I know she's been lying. I wouldn't be mad if she's been gambling, I just want her to be honest with me, I just don't want her to lie to me so openly. My trust in her is pretty much shattered at this point. I'm tempted to drive up to that remote village next time her phone pings there to find out what she's been up to but this might end up badly... I'm looking for advice here, I don't want our relationship to end like that after 5 years together